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A. DAUB'BR'.

FUMIAGE.l y No, 600,516. m Patented Mar. 15,1898.

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A. DAUBER. PURNACE.

No. 600,516. r' Patented Mar. 15, 1898.

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AUGUST DAUBER, OF BOCHUM, GERMANY.

FU RNACE.

SPECIFICATION forming part of Letters Patent 0. 600,516, dated March 15, 1898.

Application filed October 9, 1897. Serial No. 654,733. (No model.) Patented in Germany April l, 1896, No. 92,635, and in France December 7,1896,No. 261,941.

To all whom, it may concern.:

Be it known that I, AUGUST DAUBER, a subject of the German Emperor, residing at Bochum, Westphalia, Germany, have invented newand usefullmprovements in Furnaces, (for which I have received a patent in Germany, No. 92,635, dated April 1, 1896, and in France, No. 261,941, dated December 7, 1896,) of which the following is a specication.

My invention has for its object to facilitate the attendance to the furnace, the complete combustion of the fuel, the keeping in repair and working order of the mechanical constituents, and the automatic cleaning of the iire from slag and its removal. These objects of my invention are attained, first, by adjustable admission of air for the combustion by a subdivisionv of the Stoke-hole under the liregrate into three compartments in order to direct the flow of air separately under the grate-bars behind the fire-bridge and above the grate; second, by applying amechanical arrangement to shake, lift, and lower the firebars in alternation or determined succession; third, by arranging the Whole of furnace elements in a sort of carriage-frame that can be removed or pulled out together with the furnace-front5 fourth, by providing in the iniddle of the grate-surface, which inclines to- Ward the middle from both sides in its lower part, a pair of crushingrollers for reducing the coarse slag lumps and cause them to fall into the ash-pan; fifth, by providing side doors in the furnacefront and half-cylin drical guide-plates behind them, above the fire-grate and parallel to it in order to be able to feed the grate by means of long half-cylindrical shovels or feeders on its whole length in one charge.

The accompanying drawings show my invention, of whichy Figure 1 is a vertical longitudinal section of a furnace with my wind-distributing arrangement in combination with slag-Crushers and inclined fire-grate surface halves. Fig. 2 is partly a vertical cross-section along line I I and partly a similar section along the broken line II II, Fig. 1. Fig. 3 is a crosssection of a fire-bar of this grate. Fig. 4 is a horizontal section above the fire-grate with a part of the bars omitted at the right side. Fig. 5 is a front view of the furnace-front.

Little rolls A on the ends of shafts B B2 and a roll C in the lower central part of the fire-bridge serve to guide the furnace upon rails E at the two sides of the furnace and F, respectively, at the bottom of the ash-pan. A fiat inverted trough-shaped bottom M is laid in the ash-pan, dividing it into two parts, so that above the plate M an airway is formed Which diminishes in height toward the firebridge and which serves for the natural draft admission under the grate. Below the plate M is left a space or air-channel provided with a connecting-ange at the closed front for connecting it to a conduit for artificial blast and increasing in area under the plate M toward the rear, so as to admit sudicient natural or heated air to a number of upwardly-inclined conical twyers G, arranged in the lower lire-bridge Wall. A third air admission is arranged in this furnace, which leads air above the fire-grate. Differin g from the usual methods of admitting air above the combustible the air is conducted on both sides of the furnace between the grate-surface and the furnace wall or plates in special channels or airways Il and J, extending in the greater front part of the grate lfrom below the grate-bars upward above the grate. The channels or chambers H and J are closed at their botton1s,which are formed by the plate M, and they are open at their `front sides in the ash-pan and rise in passing through the grate to a level higher than the layer of fuel ou it.

Shovel-like troughs of the length of the liregrate are used for charging the coal into the furnace. Said troughs are introduced through round nre-doors L and N at the right and left of the furnace-front, Fig. 5, and are guided behind said doors by guide-plates O, Figs. 1 and 2, iixed to the front plate and situated at a certain distance above the grate. The

plates forming the upright sides of the airchannels H and J rise nearly up to the guideplates O between them and the furnace-walls, so that the upper openings of channels H and J are protected from being clogged by fuel falling into them and that the air can partly loo pass below O into the fuel and above O over the fuel into the ames. In order to admit air from all sides and in continuously-changing places into the burning fuel on the grate and in order to prevent thereby the formation of slag or cinders adhering to the {ire-bars, the grate is made so as to give to each fire-bar an oscillatory vertical movement by putting it at its front and its rear and on rotating cams R, shaped suitably to communicate to the fire-bar vsaid oscillatory movement accompanied by consecutive shocks'. Two camshafts B' B2, inclined one toward the other and driven each by separate gear U' U2 and V' V2, must be arranged as shown to move the fire-bars. The upper faces or heads of the {ire-bars are roof-shaped, as best seen in Fig. 3, and with the lower rib partly cut off at one side, so as to prevent any trouble in the up-and-down movement and to facilitate the free access of air.

The lower or middle fire-bars by the alternatively-shaking movement transport the slags or cinders collected upon them from the two sides of the grate onto the crushing-roll- -ers S and T, which may have suitable teeth and which are set in motion by a suitable driving-wheel WV outside the furnace-front. When the slag is collected on the lower rebars and brought over the rollers, the air entering from below between the latter will be heated by the slags, and these when totally burned out will be crushed and thrown into the ash-pan.

I am aware that furnaces with moved firebars and subdivided admission of air have been made prior to my invention.

I do claim as my invention and desire to secure by Letters Patentl. In combination with a trough-shaped, concave-topped division-plate M arranged in the Stoke-hole and rising toward the firebridge-supporting block D and forming an upper and a lower air-conducting ash-pan partition; of a furnace-twyer G provided under the fire-bridge in said blockD; air-channels H and J at the left and right of the furnace respectively and having front air-entrances in the upper ash-pan partition and longitudinal air-outlets situated above the grate, all substantially as set forth and for the purpose speciiied.

2. In combination with a trough-shaped concave-topped division-plate M arranged in the Stoke-hole and rising toward the rebridge-supporting block D and forming an upper and a lower air-conducting ashpan partition; of a furnace-twyer G provided under the fire-bridge in said block D; air-channels H and J at the left and right of the furnace respectively and having front air-entrances in the upper ash-pan partition; guideplates O protecting the upper outlets of said air-channels, grate-bar-supporting shafts B', B2, inclined from the higher sides toward the lower middle of the grate-surface cams R on said shafts, worm-gearing U' and U2 and longitudinal shafts V' and V2 setting said wormgearing and cam-shafts B', B2 in slow rotary motion, substantially as set forth and for the purpose specified.

3. In combination with a trough-shaped concave-topped divisioneplate M arranged in the Stoke-hole and rising toward the rebridge-supporting block D and forming an upper and a lower air-conducting ash-pan partition; of a furnace-twyer G provided under the fire-bridge in said block D; air-channels II and J at the left and right of the furnace respectively and having front airentrances in the upper ash-pan partition; guideplates O protecting the upper outlets of said air-channels, grate-bar-supporting shafts B', B2, inclined from the higher sides toward the lower middle of the grate-surface cams R on said shafts, worm-gearing U' and U2 and longitudinal shafts V' and V2 setting said wormgearing and cam-shafts B', B2 in slow rotary motion; slag-crushing rolls S T placed in the lowest part of the grate-surface between the two inclined halves and feeding-doors L and Nin the furnace-front; the whole as set forth and for the purpose speciied.

AUGUST DAUBER.

\Vitnesses:

R. E. JAHN, OTTO KNIG. 

